vim-ide-integration: remove no longer needed workaround

Fixes the problem that e.g. this code:

OUString str;
str += "";

is marked as a compile error, when clang would still work with c++11,
but the tree is configured for gnu++17.

Change-Id: Id60c0cf4b8c693b534f16ba813cf01a4bad7e560
Reviewed-on: https://gerrit.libreoffice.org/59746
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins
diff --git a/bin/gbuild-to-ide b/bin/gbuild-to-ide
index b016bfe..9ac6949 100755
--- a/bin/gbuild-to-ide
+++ b/bin/gbuild-to-ide
@@ -378,9 +378,6 @@ class VimIntegrationGenerator(IdeIntegrationGenerator):
            command += cxxflag
        command += ' -c '
        command += file
        # Help clang when the tree is configured for gcc.
        for gnu in ('-std=gnu++11', '-std=gnu++1y', '-std=gnu++17'):
            command = command.replace(gnu, '-std=c++11')
        return command